... of the rock. reservoir geomechanics experiment Upstream Oil & Gas determination estimation sandstone damage surface core sample edge effect horizontal stress correction Reservoir Characterization in-situ stress Darley Dale orientation stress state overbalance initial stress stress...

... of AE activity occurs on a 3D so-called damage surface (Holcomb, 1993), which only at one point coincides with the previous maximum experienced stress. It has furthermore been assumed that the cores will remember their native in situ stress state. The stress path followed during coring brings the rock...

... results is as a damage surface, defined as the locus of points in stress space within which stress causes no "damage." The Kaiser effect will be seen to be due to the load path intersecting the damage surface. Examples will show the form of the damage surface for common load paths for comparison...

... ABSTRACT: Acoustic emissions and conventional strain measurements were used to follow the evolution of the damage surface and plastic potential in a limestone under triaxial compression. Confining pressures were chosen such that macroscopically, the limestone exhibited both brit- tle...